SOLUTION: The rates of on-time flights for commercial jets are continuously tracked by the U.S. Department of Transportation. Recently, Southwest Air had the best reate with 80 % of its flig

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Question 345596: The rates of on-time flights for commercial jets are continuously tracked by the U.S. Department of Transportation. Recently, Southwest Air had the best reate with 80 % of its flights arriving on time. A test is conducted by randomly selecting Southwest flights and observing whether they arrive on time. (a) Find the probability that exactly flights arrive on time.
Answer by solver91311(24713) About Me  (Show Source):
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The probability of successes in trials where is the probability of success
on any given trial is given by:



Where is the number of combinations of things taken at a
time and is calculated by

For your situation, , but you didn't specify how many flights were observed nor exactly how many should be on time, so I can't help you with and

John

My calculator said it, I believe it, that settles it
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